Die.



No. 721,659. PATENTE) MAR. a, moa. f J. R. BLAKBSLEE. I

DIE.

APPLIOATION FILED HIB. 23, 1901.

N0 MODEL.

WL'n e 55 es, 17a Ugly/fog IOl UNITE-nj STATES' 'PATENT OFFICE.

JOHN` R. BLAKESLEE, GLENVILLE, OHIO.

DIE.

SPECIFICATION forming part of Letters Patent N o. 721,659, dated March 3, 1903. l Application liledIehrnary 23. 191. Serial No. 48.416. (No model.)

To tZZ whom it may concern;

Be it known that I, JOHN R. BLnKEsLEma citizen of the United States, and a resident of Glenville, county of Cuyahoga, and State of Ohio, have invented a new and useful Improvement in Dies, of which the following is a specification, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions.

My invention relates to dies for formingy or upsetting the heads of bolts, cap-screws, or the like, the object ofsuch invention being to permit of the formation of a head having a contour exactly conforming with the contour of the intaglio of the die, so as to produce sharp, well-defined, and finished outlines in such head.

Said invention consists of means hereinafter fully described, and specifically set forth in the claims.

The annexed drawings and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting but one ofrvarious nne-l chanical forms in which the principle of. the invention may be used.

In said annexed drawings, Figure I represents a plan View of a die embodying my invention for forming a squarehead; and Fig. II represents a front elevation of the same, showing also a blank secured in such die and v a portion of an upsetting-tool used in connection therewith. Fig. III represents a plan- View of a die embodying my invention for forming a hexagonal head.

My improved die consists of two parts com` jointly form the intaglio for forming the required head, the upper surface of the body portion surrounding the recess a forming the bottom surface of the intaglio, the side walls of which are formed in the cheek-piece parts.

At the contiguous surfaces of the juxtaposed cheek-piece and die-body are formed a series of air-ducts b, affording atmospheric communication with the intaglio, one duct being in communication with the apex of each solid angle formed by the intersecting planes'of the not completely lled in the upsetting operation and the resulting head is afterformation rounded instead of sharp and well defined at the corresponding points. I .have found that in the course of the upsetting process by the use of such dies the upper portion of the intaglio rst becomes completely filled before the extreme lower portion thereof, thereby impounding a small quantity of air, which gathers in the angles of the intaglio and prevents the flow of the metal therein. 4By providing the above-described air-ducts communicating with such angles, so as to permit of thefexit of air from the intaglio when the mouth thereof is closed by the upset metal,

such undesirable formation is prevented and all angles are completely filled, so as to produce a con tour of the head exactly corresponding with that of the intaglio.

The above-described die is particularly applicable to the economical manufacture of cap-screws and permits the use of unfinished or common stock inl such manufacture, necessitating only a small amount of finishing to complete a marketable article,thereby greatly red ucing their cost of production ascomparedv with that involved by any vvof the methods at present practiced, in so far as I am aware.

Other modes of applying the principle of my invention may be employed instead of the lone explained, change being made as regards the mechanism herein disclosed, provided the IOO means stated by any one of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly' claim as my inventionl. A die comprising a two-part body p0rton; cheek-pieces secured to the body por-` tion, the intaglio of the die being formed by the upper portion of the body portion, and the inner side Walls of the cheek-pieces, and having angles; and air-ducts communicating With the intaglio at the angles, as herein set forth.

2. A die for forming angular heads inbolts, comprising a two-piece body portion, the adjacent surfaces thereof each having a semi- JOHN R. BLAKESLEE.

Attest:

GEO. WM. SAYWELL, A. E. MERKEL. 

